1. (a.) Engaged in some business; hard at work (either habitually or only for the time being); occupied with serious affairs; not idle nor at leisure; as, a busy merchant.

2. (a.) Constantly at work; diligent; active.

3. (a.) Crowded with business or activities; -- said of places and times; as, a busy street.

4. (a.) Officious; meddling; foolish active.

5. (a.) Careful; anxious.

6. (v. t.) To make or keep busy; to employ; to engage or keep engaged; to occupy; as, to busy one's self with books.